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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
MMV - Extension Details
Date Added: January 01, 1970
File Extension:  .MMV
Description 1: .MMV file extension is linked with MicroMV Movie File. This is the file extension for the movie file utilized by MicroMV a videotape format developed by Sony and introduced in 2001. The cassette is smaller than the DV cassette and it is considered as the smallest format at 70% smaller than MiniDV. Sony is the sole seller of MicroMV cameras and as of January 2006, it stopped offering new MicroMV camcorders.
File Type:   Movie, Video & Multimedia File
Mode: Binary
Program(s) to Open:  utilized by Sony MiniMV
Common:
Extension: